Resilient clutch.



G. i. DOSHE.

HESILIENT CLUTCH.

APPLIEATION FILED JULY 3.1911.

1 ,272,235 Patented July 9,1918.

affimz;

enonsn J. nos'rm, or branch, MICHIGAN.

RESILIEN'I CLUTCH.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed July 3, 1917. Serial No. 178,385.

To all whom it may concern y Be it known that I, GEORGE J. Dos'rrn, citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, ha ve invented certain useful Imln-oreinents in Resilient Clutches, of which the following is a specification, reference being' had therein to the accompanying drawing.

This invention has reference generally to that class of inventions known as boring and drilling, and more particularly relates to a resilient clutch especially though not necessarily adapted for use on an electric drill.

It is the primary aim and objectof this invention to provide a clutch for arrangement between an electric drill and the chuck serving to detacliably connect the chuck to the drill so that when the tool such as the drill,

carried by the chuck becomes stuck the clutch.

will be actuated to release the electric drill and thus prevent injury to the drill as by blowing out of fuses or burning out the motor,

It is an equally important object of this invention to so construct the clutch that it will be quickly and automatically actuated when the drill is released so as to position the chuck in an inactive position so that no strain will be placed on the motor.

,More particularly the present invention embraces the provision of a clutch of such a construction that a socket wrench may be employed for attaching the same thus obviating any possibility of shearing the head of the bolt which is eliminated owing to the sensitiveness of the clutch.

Among the other aims and objects of this invention may be recited the provision of a device of the character mentioned with a view to compactness, and in which the number of partsare few, the construction simple, the c'ost of production low and the etliciency high. a

Other,nnprovements and novel details in the r construction. and arrangement of the various parts" of the' apparatus will be brought out more in detail in the description to follow, which for a clear understanding of the invention. should be considered in connection with the accompanying drawings forming a part hereof, and wherein is disclosed for the purpose of illustration a convenient and satisfactory embodiment of the invention. It is to be noted in this connection that minor changes in the construction and arrangement of parts may be made Without do arting from the principle of operation 0 the various parts.

The invention is clearly illustrated in the accompanying drawings, in which:

Figure 1 is a longitudinal section of the invention;

Fig. 2 is an end elevation looking toward the male or stationary clutch member;

Fig. 3 is an end elevation looking toward the end of the female or movable clutch member.

Similar characters of reference are employed in all of the above described views, to indicate corresponding parts.

Referring now more particularly, to the accompanying drawings, there is provided a drill A of a conveniently electric type to which is operably connected an improved clutch designated in its entirety by the letter B. A chuck C is connected to the opposite end of the clutch and has operably mounted therein a tool shank D.

The improved clutch B in the present instance consists of a stationary or male clutch member 1 the body 2 of which is circular in cross section being flattened on opposing sides at its inner end as indicated by the numeral 3 in order that it may be detachabl connected to a threaded shank 1 by means of a threaded socket 5 in the inner end of the body such as by the employment of a wrench engageable with the flattened portions 3. The opposite face or end of the body 2 is provided with an annular groove 6 while an annular flange 7' projects outwardly from the outer end. A pin 8, substantially rectangular in cross section, extends centrally from the outer end of the member for a purpose that will presently appear. A tubular casing 9 has its outer end reduced as at 10 forming a shoulder 11 in the inner periphery while an annular flange 12 extends outwardly from the inner end and is removably secured to the flange 7 by means of a plurality of threaded bolts.13. slidablyinounted in the reduced end of the, casing 10 is the cylindrical body 14 of a movable female clutch member, the outer end of the body being reduced and threaded as indicated by the numeral 15 for removable engagcment with the correspondingly threaded socket l6 in-the inner end of the chuck C. The opposite end of the bodyl is enlarged as indicated b the numeral 17 and is slidably mounted Within the main part of the tubular casing, being provided with a circular recess 18 in the bottom of which is formed a rectangular recess 19 for removable engagement with the correspondingly shaped pin 8 so that the movable clutch member will be rotatable with the stationary clutch member at times to consequently rotate the tool D. Inward sliding movement of the movable clutch member is limited when the bottom of the recess 19 contacts with the bottom of the pin 8 while outward movement is limited when the enlarged end 17 contacts with the shoulder 11 in the casing.

With a view toward providing improved resilient means for normally holding the clutch members disengaged a coil spring 20 is arranged within the casing between the two clutch members, the respective ends of the s ring bearing against the bottom of the annu ar recess 6 in the male stationary clutch member and the bottom of the circular recess in the movable clutch member.

The mode of operation of the present invention may be reviewed as follows:

Assuming that the parts have been assembled in the manner described, the drill is started so as to rotate the shank .5 and by reason of the rigid relation between this shank and the male stationary clutch membet 1, the latter will be rotated therewith. As soon as rotation of the shank occurs it is only necessary to press down on the drill proper in the usual manner when drilling, thus causing the movable clutch member 14 subsequent to the engagement of the too]. D with the work to slide in the casing so that the rectangular recess 19 will engage the outer end of the pin 8 of the stationary clutch member and obviously when this occurs the movable clutch member as well as the chuck C in the tool D will be rotated with the threaded shank 5 of the electric drill. When in operation, if the tool D representing a drill should become stuck, it is only necessary to release the pressure of the hands on the electric drill and simultaneously with this action the coil spring, which preparatory thereto is compressed, will expand so as to move the clutch members away from each other and thereby relieve any strain on the drill to prevent blowing out of fuses or burning out the operating motor.

Many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope of the claims.

Having thus fully described this invention, what is claimed as new and desired to be secured by Letters-Patent, is

1. The combination with the rotatable shank of a drilling machine, a chuck, and a tool mounted in the chuck, of a stationary clutch member carried by the rotatable shank, a movable clutch member carried by the chuck and slidable with respect to the stationary clutch member, cooperative means on the clutch members for removably holding the parts in substantial rigid relation when the movable clutch member is slid to ward the stationary clutch member, and expansible resilient means mounted between the clutch members and normally holding them in spaced relation with each other.

2. In a device of the character described, a stationary clutch member adapted to be rigidly connected, a pin projecting from the outer end thereof, a casing carried by the stationary member and surrounding the pin, a movable clutchmember slidably mounted in the casing and provided with a recess for removable engagement with the pin so that both of the members will be rotated together, and resilient means interposed between the two clutch members for normally holding them spaced from each other.

3. A device of the character described, a stationary clutch member adapted for ri id engagement with the rotating shank o a drilling machine, the outer end of the memher being provided with an annular groove, a pin rectangular in cross section p ojecting centrally from the outer end of th; *lutch member, a tubular casing rigidly connected tothe clutch member and inclosing the pin, a movable clutch member slidably mounted in the casing and ada ted to be connected at its outer end to a drill chuck, the opposite end of the movable member being provided with a circular recess and further provided in the bottom thereof with a rectangular recess for removable en agement with the pin, and a coil spring t e respective ends of which bear against the annular recess in the stationary member and the circular recess in the movablemember t'or normally holding the clutch members in s aced relation.

In testimony whereof I a x my si ature.

GEORGE J. Do TIE. 

